In this fast-changing world, two demands are being made of us. Firstly, the business wants fast (read “Agile”) delivery timeframes. Secondly, they want today’s solutions to be well-architected so they don’t get thrown away tomorrow. There might appear to be a conflict to have the business demand fast and good, but in this world of executive accountability, you’d better deliver.

3 level of data shows us the concept in data from conceptual data model, logical data model and also physical data model. By using this level, we can know the different entities in our data in terms of how they are connecting to one another to detailed about our data without thinking about how they will recover.